Apparatus for grinding long cylinders



Aug. 13, 1935. R. A. STEINBAUER APPARATUS FOR GRINDING LONG CYLINDERS Filed March 15, 1934 lllllll lllli. um

a lgVVENTOR. ez'zzzaaez Patented Aug. 13, 1935 UNITED TAT ES PATENT. OFFICE T APPARATUSFOR GRINDING LONG [CYLINDERS Raymond Albert Steinbauer, SantaMonica, Calif.

Application March 13, 1934, Serial N o. 715,283 1 7 cla ms. (or. 51-;2ei)

I My invention relates' to an apparatus designed and worked out particularly for grindinglong cylinders," such, for example, as are used in the u landing gear of heavy air craft and where speed and accuracy are required.

Among the salient objects of my invention are: to "provide an apparatusEby means of which a cylinder of any length can be accurately ground or reground for the purpose of providing a true,

smooth and perfect fit of the plunger within said cylinder; to provide an apparatus which canbe adjusted as to its grinding element relative to the holding and guiding sleeve which enters the cylinder; to provide a device ,of the character referred to which is simple, practic-aland highly eflicient in accomplishing the desiredendj and, H in general, 'to provide a grinding apparatusof *the character referredto which can be used in cylinders of any length and can be adjusted for have illustrated one practical embodiment thereof on the accompanying sheet of drawings,whic h I will now describe. In the drawing; Figure l is a side elevation of a lathe showing my invention in place theren',,with the cylinder to be ground also in place ready to'receive the grinding apparatus; I

Figure 2 is an enlarged side elevation of my invention, detached and partly in section to show theinterior thereof; a Figure 3 is a cross sectional view taken on the line 3-3 of Fig.2; and

Figure 4 is a cross sectional view taken on line l----4ofFig.2. I

Referring now in detail to the drawing; 5 desig nates as a whole a lathe of any standard type; having the usual chuck 6, traveling' carriage TI and the usual operating mechanism. This mechanism forms no part of myinvention proper, but

my invention is, used in connection with such a lathe.

The invention 'as here embodied consists of a body, sleeve or cylinder 8, having in its outer end @ber H, an operating shaft I2 is mounted to be driven from a pulley [3, as hereinafteragain referred to.

Secured to the other end of said body cylinder 8, is an extension l4 provided along one side with a groove I4, seen in Fig. 4 also, and in its a bearing member 9; resting against an annular of its bore,'as at l5,'inwhich, on the shaft l2, is a ball-bearing element 16, with a' retaining disc orplate I'l, securedagainst the end of the extension member l4, said plate having an open ing 1 8 therein large enough to permit of a limited lateral movement of the end of theshaft l2, in a manner to be described. T

Mounted over said extension M; is an outer bearing sleeve IS, the endof which is extended beyond the retaining plate I1, and is provided at one side with an opening 20, through which a grinding element 2|, mounted on the shaft l2, canprotrude to-differentdistances. It is to be understood thatthe end of the shaft l2 flexes slightly to permit the grinding element 2| to be moved to and through the opening for different distances for grinding the inside ofcylinders of different diameters. This lateraladjustm'ent is accomplished by two adjustment screws21 and 23, through the end of 'the extension member 14,

as seen in Fig. 4, the inner ends of said screws bearing against the ball-bearing element It, the opposite side of which element bears against the side ofth'e oval opening or enlargement l5 of the cylindrical extension M. This adjustment is accoinplished by turning one screw out and the other in, the ball-bearing element being thus moved in the oval opening l5 and operating to move the grinding element out or in, through the side opening 20 in the outer or hearing cylinder l9. shaft l2, hasa' three pointbearing at all times and is held in place by the two screws 22 and 23. A pipe 24 is niountedalong side of the body cylinder 8, and connects at its inner end withthe groove I 4, the other endbeing adapted to'be connected with a source of grinding fluid tobe discharged ontothe grinding element 2|, as clearly indicated in Fig. 2. Thus the invention proper is assembled as a unit. I

I will nowdescribe how the invention proper is used in connection with a standard. lathe. A holding bracket 25 is mounted on the carriage l of the lathe, as seen in Fig. 1, and the outer end of the body cylinder 8 is clamped therein, as at26 A motor 21 is also mounted on said car}- riage 'L'as indicated, with drive pulley :8 gri belt 29 to the' drive pulley l3 on the shaft ll o f the device. Thus the grinding device 'is moved forwardly endwise as the carriage l is moved on the lathe.

The tube or cylinder, designated 30, to be ground, is secured at its end in the chuck 6, as shown, with a holding bracket 3| on the lathe bed Thus the ball bearing element 16, on the r for holding the outer end of said tube or cylinder rotatably in position to be bored.

It will be understood that the outer bearing sleeve 19 of the grinding device fits snugly in the cylinder and that the grinding element 2! is adjusted to protrude through the opening 252 in the side of said bearing sleeve E9 to engage and grind the inner Wall of the tube or cylinder 38 as said tube or cylinder 39 is rotated by the lathe chuck 6.

Thus I have provided a very simple, yet a very practical and successful apparatus for accurately and rapidly grinding long tubes or cylinders and the adjustment of the grinding element is accomplished by the slight flexing of the shaft laterally, as will be understood from the showing in Fig. 2, and While I have shown and described in detail one practical embodiment of my invention, I do not limit the invention to the details of construction and arrangement, except as I may be limited by the hereto appended claims.

I claim: I I

-1. In a grinding apparatus of the character referred to, a body, a shaft extending longitudinally through said body and provided at one end with driving means, a bearing in the other end of said body for the other end ofsaid shaft, said bearing being movable laterally to move the end of said shaft laterally in said body, means for moving and holding said bearing in different posiing and the end of said shaft to protrude beyond the periphery of said body.

2. In a grinding apparatus of the character referred to, a long body cylinder supported atone end only with its other end free to telescope into another cylinder, a shaft therein, a bearing means at the supported end of said body cylinder for said shaft, driving means on said shaft, a ball bearing element in the other end of said body cylinder for said shaft, said bearing element being adjustable laterally with said shaft in said body cylinder, said shaft being supported to be flexed therewith, means for adjusting the same, a grinding element on the end of said shaft outside of said bearing element and adjustable laterally therewith to move the periphery of said grinding element to and beyond the periphery of said body cylinder, and means for supplying a fluid to said grinding element.

3. In combination, a body cylinder, a shaft therein, a bearing in one end of saidcylinder for said shaft, driving means on the end of said shaft outside of said bearing, a ball bearing element in the other end of said body cylinder for said shaft, a three point support therefor, means for adjusting said ball bearing element and the end of said shaft laterally together in said body cylinder, a bearing cylinder on the end of said body cylinder to fit within a cylinder to be ground, and a grinding ele'ment'on'the free end of said shaft outside ofsaid ball bearing element, said grinding element being adjustable laterally with said ball bearing element and said shaft to move said grinding element beyond the periphery of said bearing cylinder.

4. In a grinding apparatus, a body, a shaft, a ball bearing element in said body for said shaft, said element and shaft being movable laterally in said body, said shaft being flexibly supported, screw means for moving said element and holding it in different lateral positions, said means forming a three point support therefor, two of said supports being adjustable, means for driving said shaft, a bearing cylinder on the end of said body, and a grinding element on the end of said shaft outside of said ball bearing element and movable laterally therewith, said bearing cylinder having a side opening through its wall for said grinding element.

5. An apparatus for grinding cylinders including in combination, a body cylinder, a shaft in said cylinder, a bearing in the end of said cylinder for said shaft, drive means on the outer end of said shaft, a ball-bearing element adjustably seated in the opposite end of said body cylinder and movable laterally in said'seat with the end of said shaft, screw means for adjusting and holding said ball-bearing element and shaft in adjusted positions, a bearing cylinder over the end of said body cylinder, said bearing cylinder having an opening through the side of its end, a grinding element on the outer end of said shaft and movable laterally therewith to protrude through said opening in said bearing cylinder, and'means for supplying a suitable grinding fluid to said grinding element. I

6. In a grinding apparatus, in combination, a

long body cylinder, a long shaft therein, driving means on the end of said shaft outside of said body cylinder, a bearing element in the opposite end of said body cylinder for said shaft, said bearing element being movable laterally with the end of said shaft in said body, said shaft being flexibly held whereby one end can be moved laterally, screw means for adjusting and holding said bearing ,element indiflerent positions laterally, a grinding element on said shaft outside of said bearing element, means for holding said body cylinder at one end, said means being movable longitudinally to move said grinding apparatus endwise into atube or. cylinder to be ground, and means for holding and rotating a tube or cylinder to be ground, substantially as shown and .described.

. 7. In combination with a lathe, lathe chuck and carriage, a cylinder held and rotated by said chuck, of means for grinding said cylinder and comprising a cylinder body held by one end on said lathe carriage with its free end projecting into said cylinder, a bearing sleeve on the end of said body to fit slidably within said cylinder and having an opening through its side, a shaft in said body, a grinding element on the end of said shaft within said bearing sleeve and positioned to protrude through said opening, a bearing element for said shaft in said cylinder body, screw means for moving said bearing ele-- ment and said shaft and grinding element laterally, a motor on said lathe carriage and driving connections from said motor to said shaft, for driving said shaft and grinding element.

RAYMOND ALBERT STEINBAUER. 

